Patents Assigned to Kemira
  • Patent number: 8038846
    Abstract: According to the present invention, a process is provided for making paper or board comprising forming a cellulosic suspension that may or may not comprise a filler, flocculating the cellulosic suspension, draining the cellulosic suspension on a screen to form a sheet, wherein the cellulosic suspension is flocculated using a flocculation system comprising the sequential or simultaneous addition of a siliceous material and an organic, cationic or anionic, water-in-water or dispersion micropolymer in a salt solution.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: October 18, 2011
    Assignee: Kemira Oyj
    Inventors: Marco Savio Polverari, Christopher Michael Lewis, Matthew Gerard Fabian
  • Publication number: 20110236572
    Abstract: A dry coating binder includes a polymer which includes at least 80% by weight of main monomers. The main monomers are selected from C1-C20-alkyl (meth)acrylates, C1-C20-hydroxy alkyl (meth)acrylates, vinyl esters of carboxylic acids including up to 20 carbon atoms, vinyl aromatics having up to 20 carbon atoms, ethylenically unsaturated nitriles, vinyl ethers of alcohols including 1 to 10 carbon atoms, aliphatic hydrocarbons having 2 to 8 carbon atoms and one or two double bonds or mixtures of these monomers, and that the particle size of the binder is between 200-400 nm. Further, the use of the dry coating binder, and a dry coating composition are also described.
    Type: Application
    Filed: November 23, 2009
    Publication date: September 29, 2011
    Applicant: KEMIRA OYJ
    Inventors: Jonni Ahlgren, Nina Bruun, Vesa Nuutinen
  • Publication number: 20110224348
    Abstract: A process for preparing a dry coating composition for paper and board includes mixing at least one pigment and at least one binder and pulverizing the obtained mixture, and wherein 25% to 100% of the pigment has particle size D90 from 10 ?m to 50 ?m before mixing with the binder. Also described is the use of pigments having a particle size D90 from 10 ?m to 50 ?m in the production of pulverized dry coating composition for paper and board for improving the surface strength of a coating, which is made by dry coating a paper or board with the dry coating composition.
    Type: Application
    Filed: November 23, 2009
    Publication date: September 15, 2011
    Applicant: KEMIRA OYJ
    Inventors: Esko Aarni, Vesa Nuutinen, Mari Ojanen
  • Publication number: 20110220308
    Abstract: A paper adhesive composition includes a cationic non-crosslinked acidified solution of a polyamidoamine with the repeating units wherein n?1; m=1 or 2; X?m is chloride, bromide, iodide, sulfate, bisulfate, nitrate, oxalate, alkyl carboxylate, aryl carboxylate, hydrogen phosphate, dihydrogen phosphate, alkyl sulfonate, aryl sulfonate, or a combination comprising at least one of the foregoing anions; R1 is a divalent aliphatic, cycloaliphatic, or araliphatic group having from 1 to 24 carbon atoms; R2 is hydrogen or a monovalent aliphatic, cycloaliphatic, or araliphatic group having from 1 to 24 carbon atoms; and R3 is a divalent hydrocarbon radical derived from a dibasic carboxylic acid. Also disclosed are methods of creping paper with the composition.
    Type: Application
    Filed: May 27, 2011
    Publication date: September 15, 2011
    Applicant: KEMIRA CHEMICALS, INC.
    Inventor: Clayton J. Campbell
  • Publication number: 20110203485
    Abstract: Methods for treating lignocellulosic material or pigment with a reductive bleaching solution generally include washing the lignocellulosic material or pigment with a reducing agent of magnesium dithionite. The method includes at least one reductive stage and at least one peroxide stage. Also disclosed are methods for preparing dithionite solution wherein magnesium bisulfite is reduced with borohydride solution to obtain dithionite. Bleached lignocellulosic material or pigment obtained with the treatment methods are also disclosed.
    Type: Application
    Filed: October 30, 2009
    Publication date: August 25, 2011
    Applicant: KEMIRA OYJ
    Inventors: Risto Rahkola, Birgitta Peltopakka, Hannu Hämäläinen, Jonas Konn, Sari Vahlroos-Pirneskoski
  • Publication number: 20110201748
    Abstract: The invention relates to polymers useful as a papermaking additives. The invention also relates to methods for making and using such additives.
    Type: Application
    Filed: April 6, 2011
    Publication date: August 18, 2011
    Applicant: KEMIRA OYJ
    Inventors: Lucyna Pawlowska, Robert Proverb
  • Patent number: 7993622
    Abstract: The present invention relates to a method for preparing dithionite solution with a reaction wherein sodium bisulfite is reduced with sodium borohydride solution to obtain dithionite, wherein the rise of the pH of the solution is prevented by adjusting the pH with carbon dioxide.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: August 9, 2011
    Assignee: Kemira OYJ
    Inventor: Risto Rahkola
  • Patent number: 7988821
    Abstract: The invention relates to a process for the treatment of a fibre material comprising the step of contacting the fibre material in an aqueous medium with a chelating agent and a polymer having following general formula wherein R1 is a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, R2 is —COOM or —CH2COOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol. The invention also relates to a composition comprising a chelating agent and the above polymer.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: August 2, 2011
    Assignee: Kemira Oyj
    Inventors: Seung-Hoon Lee, Jonni Ahlgren, Jukka Jäkärä, Aarto Parén, Jukka Rautiainen, Ilkka Renvall
  • Publication number: 20110174454
    Abstract: A method for making an opacity relevant grade paper or paperboard product, such as a communication type paper used for printing and writing applications, utilizes an effective amount of quaternized alkanolamine fatty acid ester compounds as an opacification aid to control the optical properties of the paper or paperboard product as a wet-end additive to a papermaking operation. Using the quaternized alkanolamine fatty acid ester compound can improve the opacity of the paper or paperboard product, maintain the opacity of the paper while reducing the use of other opacification aids, such as inorganic fillers and/or pigments, and allow for a reduction in paper grammage without a compromise in opacity. The improvements in paper optical properties are achieved without adversely affecting other characteristics of the paper product such as bulk value, tensile strength, tear index, and the like.
    Type: Application
    Filed: March 22, 2011
    Publication date: July 21, 2011
    Applicant: KEMIRA CHEMICALS, INC.
    Inventors: Brian N. Brogdon, Gary M. Freeman, Thomas C. Friel, Scott W. Rosencrance
  • Patent number: 7981250
    Abstract: According to the present invention, a process is provided for making paper or board comprising forming a cellulosic suspension that may or may not comprise a filler, flocculating the cellulosic suspension, draining the cellulosic suspension on a screen to form a sheet, wherein the cellulosic suspension is flocculated using a flocculation system comprising the sequential or simultaneous addition of a siliceous material and an organic, cationic or anionic, dispersion micropolymer in a salt solution.
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: July 19, 2011
    Assignee: Kemira Oyj
    Inventors: Marco Savio Polverari, Christopher Michael Lewis, Matthew Gerard Fabian, Sr.
  • Patent number: 7973195
    Abstract: An unsaturated quaternary ammonium salt is produced by a process that includes reacting methyl chloride in a first vessel with a stoichiometric excess of an unsaturated tertiary amine in the presence of water to form a reaction mixture that includes the unsaturated quaternary ammonium salt and residual unsaturated tertiary amine. The reaction mixture is transferred to a second vessel and phase separated to yield a first fraction in which the unsaturated quaternary ammonium salt is concentrated, and a second fraction in which the residual unsaturated tertiary amine is concentrated. At least a portion of the second fraction is recycled from the second vessel to the first vessel for use in the reaction with methyl chloride.
    Type: Grant
    Filed: July 22, 2009
    Date of Patent: July 5, 2011
    Assignee: Kemira Oyj
    Inventors: Mohan Nair, C. Joseph Calbick
  • Publication number: 20110155334
    Abstract: The present invention provides methods for deinking printed waster paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically-MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations (“ERIC”) values.
    Type: Application
    Filed: January 18, 2011
    Publication date: June 30, 2011
    Applicant: KEMIRA CHEMICAL, INC.
    Inventors: Scott Rosencrance, Charles M. Ngome, Kevin M. Hale
  • Patent number: 7964669
    Abstract: A thermosetting resin comprising a reacted A) first partially crosslinked glyoxalated polymer comprising a reacted (i) first polyacrylamide backbone and (ii) a first glyoxal component; and B) a second crosslinked glyoxalated polymer comprising a reacted (i) second polyacrylamide backbone and (ii) a second glyoxyal component; such that the first polyacrylamide backbone has a molecular weight that is less than the molecular weight of the second polyacrylamide backbone; and the first polyacrylamide backbone and the second polyacrylamide backbone have a weight ratio ranging from 75:25 to 95:5. Methods for making and using the resin. Fibrous substrates made with the resin.
    Type: Grant
    Filed: April 2, 2010
    Date of Patent: June 21, 2011
    Assignee: Kemira Oyj
    Inventors: Robert Joseph Proverb, Lucyna M. Pawlowska
  • Publication number: 20110139388
    Abstract: A cationic starch graft copolymer is prepared by polymerization of monomers a) to d) a) 20-80% by weight of acrylamide, methacrylamide or mixtures thereof, b) 3-20% by weight of at least one basic or cationic vinyl monomer; c) 0.005-1.5% by weight of at least one bifunctional or higher-functional crosslinking agent, d) 0-10% by weight of at least one nonionic or anionic vinyl monomer which differs from the monomers mentioned under a) to c) in the presence of a grafting base e) e) 15-70% by weight of at least one starch or one starch derivative, the sum of a) to e) being 100% by weight.
    Type: Application
    Filed: February 18, 2011
    Publication date: June 16, 2011
    Applicant: KEMIRA OYJ
    Inventors: Bernd Hauschel, Bernd Thiele, Thomas Hübbe, Bernhard Jansen
  • Publication number: 20110137051
    Abstract: The invention relates to a process for the recovery of concentrated high purity formic acid having a concentration of at least 50%, most preferably at least 95%, from biomass wherein an aqueous liquid mixture containing levulinic acid and possibly furfural is subjected to a liquid-liquid extraction step, followed by the recovery of furfural, formic acid and levulinic acid.
    Type: Application
    Filed: April 21, 2009
    Publication date: June 9, 2011
    Applicant: KEMIRA OYJ
    Inventors: Jarmo Reunanen, Pekka Oinas, Timo Nissinen
  • Patent number: 7943789
    Abstract: The invention relates to an aqueous sizing composition comprising (a) an emulsion comprising an alkenylsuccinic anhydride component containing alkenylsuccinic anhydride particles suspended in a first starch component containing emulsifying starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and (b) a second starch component selected from the group consisting of non-ionic starches, ionic starches and mixtures thereof, such that the alkenylsuccinic anhydride and the starch in the emulsion and the second starch component are present at a starch: alkenylsuccinic anhydride weight ratio that is sufficiently high to enable the sizing composition to impart useful sizing properties to a fibrous substrate when the sizing composition contacts the fibrous substrate. The invention also relates to fibrous substrates treated with the sizing composition, processes for making the composition and processes for using such a composition, and other compositions.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: May 17, 2011
    Assignee: Kemira OYJ
    Inventors: Harold A. Goldsberry, III, Kimberly C. Dilts, Charles R. Hunter, Michael P. O'Toole, Robert J. Proverb, Lucyna Pawlowska, Glenn E. Baikow, Katarzyna Komarowska, David L. Dauplaise, Michael J. Scanlon
  • Publication number: 20110108221
    Abstract: The present invention relates to cost-effective and environmentally friendly polyester surfactants for use in flotation deinking. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentration values.
    Type: Application
    Filed: November 11, 2009
    Publication date: May 12, 2011
    Applicant: Kemira Chemicals, Inc.
    Inventors: Terrence Cotter, Scott W. Rosencrance, Robert Wilson
  • Patent number: 7935222
    Abstract: A method for making an opacity relevant grade paper or paperboard product, such as a communication type paper used for printing and writing applications, utilizes an effective amount of quaternized alkanolamine fatty acid ester compounds as an opacification aid to control the optical properties of the paper or paperboard product as a wet-end additive to a papermaking operation. Using the quaternized alkanolamine fatty acid ester compound can improve the opacity of the paper or paperboard product, maintain the opacity of the paper while reducing the use of other opacification aids, such as inorganic fillers and/or pigments, and allow for a reduction in paper grammage without a compromise in opacity. The improvements in paper optical properties are achieved without adversely affecting other characteristics of the paper product such as bulk value, tensile strength, tear index, and the like.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: May 3, 2011
    Assignee: Kemira Chemicals, Inc.
    Inventors: Brian N. Brogdon, Gary M. Freeman, Thomas C. Friel, Scott W. Rosencrance
  • Publication number: 20110098490
    Abstract: Processes for the recovery of formate salt from biomass and the product obtained thereof generally include subjecting an aqueous liquid mixture containing levulinic acid, formic acid and possibly furfural to a liquid-liquid extraction process, followed by the recovery of the furfural, the formate salt and the levulinic acid or the levulinate salt.
    Type: Application
    Filed: April 21, 2009
    Publication date: April 28, 2011
    Applicant: KEMIRA OYJ
    Inventors: Jarmo Reunanen, Pekka Oinas, Timo Nissinen, Esko Tirronen
  • Patent number: 7915445
    Abstract: The invention relates to a method and an arrangement in which a percarboxylic acid product is prepared and used. Conventional methods include refrigerated transport and double storage of the percarboxylic acid product before the consumption thereof at its site of use. These expensive stages have now been eliminated carrying out the preparation in connection with the use.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: March 29, 2011
    Assignee: Kemira Oyj
    Inventors: Lauri Maatta, Seppo Pohjanvesi